<!--  -->
<template>
  <div class="type-nav">
    <!-- 分类导航移入移出新加的标签 -->
    <div @mouseleave="hideSubCategory" @mouseenter="showFirst">
      <div class="container">
        <h2 class="all">全部商品分类</h2>
        <div class="sort" @click="toSeach" v-show="hideFirst">
          <div class="all-sort-list2">
            <!-- 三级分类之第一级 item -->
            <div
              class="item bo"
              v-for="(c1, index) in baseCategoryList"
              :key="c1.categoryId"
              :class="{ item_on: currentIndex === index }"
              @mouseenter="showSubCategory(index)"
            >
              <h3>
                <a
                  href="javascript:;"
                  :data-categoryName="c1.categoryName"
                  :data-category1Id="c1.categoryId"
                  >{{ c1.categoryName }}</a
                >
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <!-- 三级分类之第二级 -->
                  <dl
                    class="fore"
                    v-for="c2 in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dt>
                      <a
                        href="javascript:void(0)"
                        :data-categoryName="c2.categoryName"
                        :data-category2Id="c2.categoryId"
                        >{{ c2.categoryName }}</a
                      >
                    </dt>
                    <dd>
                      <!-- 三级分类之第三级 -->
                      <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                        <a
                          href="javascript:void(0)"
                          :data-categoryName="c3.categoryName"
                          :data-category3Id="c3.categoryId"
                          >{{ c3.categoryName }}</a
                        >
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
        <!-- 将nav移入下面 -->
        <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>
      </div>
    </div>
  </div>
</template>

<script type='text/javascript'>
//引入vuex
import { mapState } from "vuex";
//引入throttle节流
import throttle from "lodash/throttle";
export default {
  name: "typenav",
  data() {
    return {
      currentIndex: -2,
      hideFirst: true,
    };
  },

  components: {},

  //vuex module化
  // computed: {
  //   //  ...mapState({
  //   //    baseCategoryList:state=>state.home.baseCategoryList
  //   //  })
  // },
  computed: mapState({
    baseCategoryList: (state) => state.home.baseCategoryList,
  }),

  methods: {
    //throttle以毫秒记
    showSubCategory: throttle(function (index) {
      if (this.currentIndex !== -2) {
        this.currentIndex = index;
      }
    }, 200),
    //鼠标离开的事件的回调，无高亮显示效果
    hideSubCategory() {
      this.currentIndex = -2;
      if (this.$route.path !== "/") {
        this.hideFirst = false;
      }
    },
    //三级分类菜单点击事件（事件委托方式）用来实现路由跳转及传参
    toSeach(e) {
      const nodeTarget = e.target;
      if (nodeTarget.nodeName === "A") {
        // console.log(nodeTarget.dataset);
        const { category1id, category2id, category3id, categoryname } =
          nodeTarget.dataset;
        //定义query参数对象
        const query = {
          categoryName: categoryname,
        };
        //
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else if (category3id) {
          query.category3Id = category3id;
        }
        //定义query参数对象 end

        //实现路由跳转
        // this.$router.push({ path: "/search", query });

        //search页和非search页的跳转判断
        const { path, params } = this.$route;
        //1.如果当前在search页
        if (path.indexOf("/search") === 0) {
          this.$router.replace({ path, query, params });
        } else {
          //2.如果当前页面不在search页
          //, params
          this.$router.push({ path: "/search", query });
        }

        //高亮显示消失，隐藏三级分类菜单
        this.currentIndex = 2;
        this.hideFirst = false;
      }
    },

    showFirst() {
      (this.hideFirst = true), (this.currentIndex = -1);
    },
  },

  //mounted 判断是否在首页，不在首页则隐藏分类导航
  mounted() {
    if (this.$route.path !== "/") {
      this.hideFirst = false;
    }
  },
};
</script>
<style lang='less' scoped>
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
          &.item_on {
            background-color: greenyellow;
          }
        }
      }
    }
  }
}
</style>